Which of the following conditions will ensure that angular momentum is conserved? I. Conservation of linear momentum II. Zero net external force III. Zero net external torque,I and II only,I and III only,II and III only,III only,D
"A pipe full of air is closed at one end. A standing wave is produced in the pipe, causing the pipe to sound a note. Which of the following is a correct statement about the wave’s properties at the closed end of the pipe?","The pressure is at a node, but the particle displacement is at an antinode.","The pressure is at an antinode, but the particle displacement is at a node.",The pressure and the particle displacement are both at nodes.,The pressure and the particle displacement are both at antinodes.,B
"A photocell of work function ϕ = 2eV is connected to a resistor in series. Light of frequency f = 1 × 10^15 Hz hits a metal plate of the photocell. If the power of the light is P = 100 W, what is the current through the resistor?",2:00 AM,6:00 AM,12:00 AM,24 A,D
"A microwave oven is connected to an outlet, 120 V, and draws a current of 2 amps. At what rate is energy being used by the microwave oven?",10 W,30 W,60 W,240 W,D
"A point charge, Q = +1 mC, is fixed at the origin. How much work is required to move a charge, Q = +8 µC, from the point (0, 4 meters) to the point (3 meters, 0)?",3.5 J,6.0 J,22.5 J,40 J,B